From WordNet (r) 3.0 (2006):
flop
adv 1: with a flopping sound; "he tumbled flop into the mud"
2: exactly; "he fell flop on his face" [syn: right, flop]
n 1: an arithmetic operation performed on floating-point
numbers; "this computer can perform a million flops per
second" [syn: floating-point operation, flop]
2: someone who is unsuccessful [syn: flop, dud, washout]
3: a complete failure; "the play was a dismal flop" [syn:
flop, bust, fizzle]
4: the act of throwing yourself down; "he landed on the bed with
a great flop" [syn: flop, collapse]
v 1: fall loosely; "He flopped into a chair"
2: fall suddenly and abruptly
3: fail utterly; collapse; "The project foundered" [syn: fall
through, fall flat, founder, flop]